Nice find! I have one very similar in stainless and looks like a different barrel, yours looks more rounded and mine is a slab barrel.
mine is built on a 67 frame and they bobbed the hammer to make it double action only, even though it will cock if you can grab the hammer.
They built it in the Anaeim store when it was around back in the late 80's. They also did several Commemoratives for my Agency, still have a model 68 in the walnut box that our Association did with a belt buckle.
Enjoy it,